some code climate fixes

app/controllers/maps_controller.rb

@@ -91,8 +91,8 @@ class MapsController < ApplicationController
 
   # GET maps/:id/export
   def export
-
     exporter = MapExportService.new(current_user, @map, base_url: request.base_url)
+
     respond_to do |format|
       format.json { render json: exporter.json }
       format.csv { send_data exporter.csv }

config/initializers/mime_types.rb

@@ -5,4 +5,4 @@
 # Mime::Type.register "text/richtext", :rtf
 
 # RDF export
-Mime::Type.register "text/turtle", :ttl
+Mime::Type.register 'text/turtle', :ttl